Pull to refresh doesn't work

[MahmoudElmoghazy]

I have and issue i used the collection view and added to it pull to refresh widget put when i pull on list view no something shows
`

		<ListView id="prodcts" defaultItemTemplate="default" module="CollectionView" method="createCollectionView">

			<HeaderView>
				<View class="headerView">
					<!-- Tabs view -->
					<ScrollView id="tabs" onClick="tabsClicked"/>

					<!-- Banner-->
					<View id="categoryPagerHolder" height="Ti.UI.SIZE">
						<Require type="view" src="categoriesModules/CategoryPager" id="categoryPager"/>
					</View>

					<!-- features products -->
					<View id="home_Categories_Products"/>
				</View>
			</HeaderView>

			<Templates>

				<Require src="templates/twoProductsTemplate"/>

			</Templates>

			<ListSection id="mainListSection" columnCount="2" module="ti.collectionview" method="createCollectionSection"/>

			<FooterView>
				<View class="footerView">
					<ActivityIndicator id="footerLoading"/>
				</View>
			</FooterView>

		</ListView>
	</Widget>

`